Posted by Shawn.Curry on May 13, 2019; 12:17am
URL: https://forum.librecad.org/Trouble-with-moc-when-compiling-with-Qt-Creator-on-Windows-tp5717046p5717372.html

/usr/bin/sh wouldn't be a valid command on Windows unless you're in a cygwin shell or something.

You try it without that?  

By the way, I've made several changes that were just merged today, which address many issues with the windows build process.  Try starting from scratch now and follow the build instructions carefully.  By "from scratch" I mean uninstall everything including Qt.  I agree with Armin's assessment, you probably made a wrong turn somewhere with your Qt install.